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#11
I realize this is a very old thread, but I thought I'd throw this in for anyone else looking. I just had this issue with a 64 bit program, and compatibility settings are greyed out on Windows 7. BUT! If you click the button at the bottom of the Compatibility tab that says "Change settings for all users" it will open "Compatibility For All Users" window that will have compatibility mode NOT greyed out and you will be able to change it.
I had two separate programs trying to install under different versions of windows. One under XP and the other Vista. No idea why it was happening since I never need to change compatibility settings.
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